“English Understanding” Classes---What should students understand?---

As the discussion on a new school guideline is proceeded by Ministry of Education, Culture, Sports, Science and Technology, content-based presentation-oriented English classes are on agenda. Each text has its contents, and belongs to a wider or more universal context. Understanding the text or its contents has been said to require both bottom-up reading and top-down reading. The latter reading implies that the knowledge on the context the text belongs to is important to understand the text itself. The context each text belongs to has been called as a topic. Having more knowledge on more topics has been believed to help top-down reading. The truth it may be, but we need certain know-how to connect the knowledge of some topic to the understanding of a text which belong to the topic.
Talking about content-based English classes reminds us that many English classes are still based on grammars and idioms. The knowledge on grammars and idioms is certainly one of the best tools to do bottom-up reading.
We have presentation-oriented English classes already: Writing, English Expression, and the like. The question is whether they are content-based. To have content-based presentation-oriented English classes, we are to conjugate these 2 learning processes.